Machine for grinding and polishing lenses.



Patented Aug. 23, 1910.

3 SHEETS-SHEET 1.

wwmboz wmbi K.'LIEGANDT. MAOHINE FOR GRINDING AND POLISHING LENSES.

APPLICAT ON FILED AUG. 20. 1909.

Patented Aug. 23, 1910.

3 SHEETSSHEET 2.

asb lzga ject' of the Czar of Russia, residingin' New re'presents a front-elevation, partlyjin verersin position for. -1ise, while the -otherhalf shows the grinding devices. removed for The frame is made of' oblong shae, and" and State of -'New York, haveinvented eer-' of which the following a specification. Thisinvention relates to certain improve- ;ing lenses' for o tical 'pur'oses in sucha 'manner that tip ural'ity 0 lens-blanks are ground to the proper shapeat the same time in a reliable and effective manner" and for- -frame, a p uralityof lens'holdrs, pivotedlever-arms for supporting the lens-holders,

described hereinafter and finallyjpointedi'out' machine for grinding and polishing lenses, Fig. 2 isa plan-viewof the same, one-half 7 Similar letters of-re'ference indicate sponding'parts throu' houtlthefigures 'gverse angle-irons f 1 On the ugl er-1 which carriesa water-collecting pan ash-av: fgihgirounded-olf endsr. In the pan a a1 .e' arranged two grinder-holding frames of of oblong shape,- which are pivoted atopposite tailed bars athat ne atena correspo'nd-l UNITED s rn'rns PATENT OFFICE.

- mannmennnm, or-NEw'YonKj'N. .Y.

' MACHINE FOR enmnme AND ro-msi-irim LENSES.

Specification Lettersfatentf;P?,fent d .2 19 0 Application-filed August 20, 1909". 'seriain 513,733.

To'alliwfiomit concern: i 4 Be it known that-LlKAnL'LmeANnr, a sub:

York, in the borough of Manhattanhcounty tain new and useful Improvements in Machines for Grinding and Polishing Lenses,

ments in machines for grinding ahd'pOlishthis purposevthe invention consists of a ma chine for grinding and polishing lenses which comprises aplurality of grinders, a frame for said grinders, means for impart-. ing a rotar motion to the grindenholdinga' 'u'niversal joint connection between the lever-arms and. lens holders and sprin'g-oushioned hand-levers for raising or lowering the lens holders as required.

The invention consists details of construction which will be fully:

in the claims." v

In the accompanying. drawings, .Figure- -1 tical longitudinal section, of my v-nnproved of the machine being. shownwith theind-- showing the lenssholders and their supporting frame, and Fig.3 is a vertical transverse sectionon line 3, 3, Fig. 1.

-R-eferr ing to the; rawings f represent the supporting f'rameaoi mproved machine for grinding and .polishing; lenses provided with upright .cornerstan ards fl which are-braced by longitudinal and trans m tion' of the frame 7 is arranged when ends by means of. erforatedears a to dove-5 shafts 8?,8. being, supported on the longitud'inal'a-nd transverse angle-irons f 3 of -,clutch mechanism vc which is compos,

tinned, into engagement with the/fixed transversememberon the shaft; 8. The

(iingly, shaped-grooves ro'vided in crank-- isks a attthe' ujpper en s of upright shafts .5," s, of whiqh 'theshafts s are supported by neck and step bearings (2,1) and driven by so pulley and belt 'ftransmissions from an upright -driving;' shaft '8, while the shorter shafts js are s'iipgort'ed by neck and ste bearings 6 ,1), t'e neck-bearings of both the frame j g While: the step-bearin s b? of the driving-shaft s are supporter on the shaped pulleys pt, a-fid' trans pitting belts?) from step-shapfl'pulleys-p on'thetdrivingy g shaft .9, as shown clearly in Fig. .1'. filrtherof certain The motion'of the intermediate shaft .5 can. be instantly-Jarrested by means or- 1a spring-cushioned 'elutch member a g onthe. shaft stand connected with' 'r. c -that ispiVOted a-toneend to an up glint.

f oftheframe f,va-nd.at-t he other end c o'ii "nected by apivot-rod 0 with a lever 0'.

which carries a treadle' t at its front-end and which is" pivoted at its rear-end to a tra-nsverse-angle -iron f at the lower part of the framef. The clutchmember 0 i'n'terlooks with a fixed transverse clutch member '0 on the shaft 8; so'that the latter is not ro- I .tat'e'rl when the-clutch member 0 is released from the sliding and springcu'sl'gjoned .member'o the depression .of the tre'adle t, but rotated as. soon as'the treadle is re:

aseclflagd thegsliding clutch-,mertib r re- 10 v cushioning:spring -v'of the-sliding ChItC-hn member 0 isinterposed' between" the clutch i lever a -'and a fixed .co'llaf c onltheglower-l fi -.Iportion;'of the shaft'sg' Assoon-as one ofthe fjtr'eadles" is lowered; -.{the' sliding-rand f's "Tring"-eiishi0ned cl'u'tch-- member a? is with; rawn from 1 the transverse clutch member of and-moved out of engagement therew th {s so as to produce the instant interruption of 5v the niotionof the grinder holding frame a connected with shaft s -l--.- In.eacli lens;

holdingframe c is arranged a plurality of holders h for the grinders .h. "In tlidmvw ing eight grinders are showh." 4

The grinders h are made of steel or other suitable material and are of'convex' oriother 1 -of washers gf'. so

shape,

according to theshape tobe given to the lenses'g" The lens-holders g are connected by universal joints 9 with the front- ,Qends oflever-arms 9 that are arranged par: and with each other,

and pivoted 'attheir rear-ends, by means of eyes 9 to. av trans- 4 i'ch is supported in perforated ,earsg chine, The eyesd are separated by means proper position on the pivot-rod- One set of lever-arms g which holds the lens,-

holders fo'r'the rear-row of lens-blanks is.-

made straight,- while the intermediate set of lever-arms which holds the lens-holders for the front row of lens-blanks is curved at right angles at the outer ends so as -'not to interfere witht-he adjacent set of levers 9 The grinders and their levers areheld. in proper position by means of a number of manually operated levers i, which are located below the-pan (2?, saidflevers being connected by means, of

other above each lever dwiththe lever. arms g said vertical. connecting rods being guided in suitable thimbles-z' secured into into raised-position, as shown in dotted lines in Fig. 3, the lens-holder and its supporting arm are raised and the upper spring z set to tension, while a the tension of; .the lower spring is released. On the other 'liand,-When the lever 71 is loweredso as to move the lever arms g and the lens-holder mto its lowered position, the tension of the upper spring is released and the lower spring compressed, the upper spring assisting n the lowering and the'flower' sprlng assisting in the raising of'the' lever i, lever arm 9 and lens-holder 9.. The vertical rods 6 are oon-- ue'cted at their upper ends means of transverse pivots i withslots Z in the lever ims 9 so to permit thereby the free raising and loweringof the same by the hand-levers a when they are placed in raised or lowered position.

Rotary motion is imparted to the grinder-.

holdin frames a by the rotation of the crank 'sks a and their pivot-connection dovetailed bars on the table a of the ma-* as to beheld in their vertical rods 72 and" rounded-off screw-nuts.i one below and the with the ears of the frames a.- pr smaller extent of motion or lmparted to the frames'a pivot connection \Vltll tlIt some distance to one side center of the disks.

stroke" is or theother of the This is accomplished by shifting the-dovetailed bars of the crank-' disks int-he dovetailedgrooves of thesame to one side ortheother.

are placed in line with the axis of. the driving-shafts, no motion is impartedito the grinder-holding frames; but

when the dovetailed bars are-adjusted to-one .When the ears and by setting the crank-disks a at side or the other of the driving crank-disks,

motion is imparted to the supporting frames, .all the partsdescribing a circle the radius ofwhich is equal to twice .the distance longitudinal center-line-of the 'frame. The greater this distance or eccentricity- 0f the center of the perforated cars from the cen? tend the crank-disks, the greater is the circle described by every art of the grinderholding frames and tie .holders therein. The degree of circular motion .to be im: partedto the holders depends on the size' of the lenses and the degree of concavity or convexity to be im arted. to, the lenses.

'of' the center of the crank-disks from the 1 When the dovetaile .bars are set to' theproper position in the driving crank-disks, set-screws a,

through the same, are turned'inwardly .toward the dovetailed bars and the 'latter thereby locked rigidly in position. When a different adjustment is necessary, the setscrewshave to be loosened, so. as to ermit the shifting of the dovetailed bars in the grooves of the driving crank-disks a By ar nginga plurality ofgrinder-holding frames an holders, one attendant cansupervise the grinding of eight, or multiples of eight, lenses at a time. The construction s as a double grinding machine, and provides for the grinding of-sixteen lensesat the same time; but it is obvious that the size of the frame and table can be doubled and another set of sixteen grinders be arranged thereon, which are driven from another driving shaft, and so on, or only one set of eight grinder-holders may be used, in which ca'se the output is correspondingly diminished. .As the grinders act with a uniform degree of pressure on the lenses, a uniform grindin'g action is exerted on the same. -When one side of the lens-blanks is completed, they are turned around and again cemented into iown in the drawings is arranged.

which pass horizontally their dops and then finished on the opposite side. .After the grinding action is completed, the polishing of bothlsurfaces is accomplished by the addition of a suitable polishing powder to the water in the frames, so that perfectly smooth surfaces are obtained.- As.- one man can easily attend to a machine with sixteengrinders and supervise the progress of the Work by lifting from time to time. the lenses by means of the handlevers from the front-end of the machine,

the grinding and polishing of lenses of all holding frame, means for imparting circumferential motion to the holding-frame and holding its axis parallel to a'fi xed line in its 1 plane of movement, grinder holders supported in said'frame, lens-holders above said grinder holders pivoted lever arms, and

spring-cushione means forraising or low ering said lever-arms and lens-holders.

2. In a machine for grinding and polishing lenses the combination of a supporting frame, a pair ofsep'arated parallel rotary shafts supported on said frame; a'holding frame mounted at separate points eccentrically on said shafts respectively, holders on said holding frame and additional holders 'cooperating'with the first-named holders.

3. In a" machine for grinding and polishing lenses, the combination of a supporting frame, aTgrinder-holding frame, means for imparting rotary motion to'the same, grinders supported in'said frame, of lens-holders 1 above the grinders, pivoted lever-arms, universal joints between said lens-holders and the lever arms', hand-levers pivoted at their rear-ends, npright. connecting rods pivoted to thelever-arms and hand-levers, and cus'iioning springs placed aboveand below the "connecting rods between fixed points on too rods and stationary pointson the supporting frame: v

In testimony,'that'I .claim the foregoing as myinvention, I have-signed my name in presence of two subscrlbing Witnesses.

KARL LIEGANDT.

Witnesses: I

PAUL GoEPEL, J. A. CooK 

